TRANSPORT CHARACTERISTICS OF SUSPENDED SEDIMENT ON MUD FLAT IN A TIDAL CHANNEL
Acoustic Doppler current profilers (aDcps) offer the potential for measuring suspended sediment concentration profiles. In recent years, aDcps operating at a few megahertz frequency have been able to measure velocity and backscattered signal profiles with a high degree of temporal and spatial resolution. Moreover, the blanking distance near the transducer becomes short.As a result, the aDcps may attain high-resolution measurements of suspended sediments in the bottom 1-2 m above the bed. However, a modification needs to be made to account for the complex beam pattern close to the transducer (near-field). In the present study, the backscattered signal of an aDcp operating at 2 MHz is examined. The backscattered signal profiles corrected using the near-field function by Thorne give close agreement,with suspended sediment concentration profiles on the tidal flat in an estuary.
suspended sediment concentration acoustic backscatter mud flat tidal flow estuaries
Kiyoshi Kawanishi Tomoya Yokoyama
Department of Civil & Environmental Engineering, Hiroshima University,1-4-1 Kagamiyama, Higashi Hiroshima, Japan
国际会议
第16届亚太地区国际水利学大会暨第3届水工水力学国际研讨会(16th IAHR-APD Congress and 3rd Symoposium of IAHR-ISHS)
南京
英文
809-814
2008-10-20（万方平台首次上网日期，不代表论文的发表时间）